I mean yes, this is very clearly a crystal and not a symbol. But it honestly could be an item relating to the box legends… it seems to be a burst of light, and Scarlet and Violet are extremely likely to be catchier ways of representing Infrared and Ultraviolet aka the ends of the visible spectrum (or just outside it), since while Scarlet is closer to orange than not, it ends in LET just like Violet and is therefore catchy together as a pair.So yeah, this crystal could just be a legendary item that ends up being used on the box Legend and ties into the light spectrum.
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